Navigate to Overcast in App launcher and select the Settings tab, and choose your Overcast Endpoint (the overcast server). Select the endpoint that properly reflects both your region and either the production or sandbox instance. If the endpoint is custom, provide the URL for the endpoint. Once saved, the endpoint should not be changed. Changing the endpoint after it has been established can lead to malfunctions with Integration Scenarios.
Navigate to Connection Strings in Overcast and create SAP and Salesforce connection strings if they are not yet established. Go to Create a Connection String for the instructions.